1813231141 has 4 divisors (see below), whose sum is σ = 1813322752. Its totient is φ = 1813139532.

The previous prime is 1813231111. The next prime is 1813231171. The reversal of 1813231141 is 1411323181.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1411323181 = 21481 ⋅65701.

It is an interprime number because it is at equal distance from previous prime (1813231111) and next prime (1813231171).

It is a cyclic number.

It is not a de Polignac number, because 1813231141 - 2¹⁹ = 1812706853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1813231111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2415 + ... + 60268.

It is an arithmetic number, because the mean of its divisors is an integer number (453330688).

Almost surely, 2^1813231141 is an apocalyptic number.

It is an amenable number.

1813231141 is a deficient number, since it is larger than the sum of its proper divisors (91611).

1813231141 is an equidigital number, since it uses as much as digits as its factorization.

1813231141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91610.

The product of its digits is 576, while the sum is 25.

The square root of 1813231141 is about 42582.0518646061. The cubic root of 1813231141 is about 1219.4136618564.

The spelling of 1813231141 in words is "one billion, eight hundred thirteen million, two hundred thirty-one thousand, one hundred forty-one".